1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, 430071 Wuhan, China
2. College of Civil Engineering and Architecture, Guilin University of Technology, 541004 Guilin, China
3. Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering, Guilin University of Technology, 541004 Guilin, China